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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137f265e120304cc770cd8fd74cb9764ed66a676153fd68e04f61646f981a92a' 
  AND token = 'AJlAHFcfqLZ+vNymzTZUFk6PlqWxjMlqL8lfkS2neQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}